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Police Scotland are appealing to motorists in the area who may have seen the man, who was dressed in dark clothing, walking towards the Erskine Bridge before the incident happened.

In a statement, the force said: "In particular, anyone with a dashcam is asked to check their footage and hand it in to police as the images could provide important details which could assist the investigation."

Anyone with information is asked to call road policing officers at Dumbarton Police Station via 101.